Alternate function mapping table

[andreaspiezia9]

Posted on October 18, 2013 at 11:04

Hi all,

at page 135 of 

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/reference_manual/CD00240193.pdf

, I found a note: ''To know which functions are multiplexed on each GPIO pin, refer to the datasheets.'' But I didn't find the datasheet for 

STM32F303VCT6.

At the end, I need to know which value insert in the registers GPIOx_AFRL and GPIOx_AFRH. Can someone help me?Thanks #lmgtfy #lmgtfy:-stm32-resources #alternate-function-mapping #stm32f303vct6-alternate-function #goes-to-15

[Tesla DeLorean]

Posted on October 18, 2013 at 13:34

http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1576/LN1531/PF252054

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00058181.pdf

[andreaspiezia9]

Posted on October 21, 2013 at 09:29

Hi Clive,

thank you.But I can't find the table with the values used for GPIOx_AFRL (for pin 0 to 7) and GPIOx_AFRH (for pin 8 to 15) configuration in order to select the appropriate alternate function.Probably there is something that I didn't understand. 

[Tesla DeLorean]

Posted on October 21, 2013 at 15:36

Click on the ''Pg 43'' link provided, navigate to Page 43, observed the table, AF0=0, AF1=1,..AF15=0xF

[andreaspiezia9]

Posted on October 21, 2013 at 16:15

Thank you Clive,

now is clear:for selecting the AF1, I need to write 0x00000001 both for GPIOx_AFRL and  GPIOx_AFRH as reported at page 147 of 

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/reference_manual/CD00240193.pdf

[Tesla DeLorean]

Posted on October 21, 2013 at 16:26

You might want to select the Reference Manual for your part, RM0316

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/reference_manual/DM00043574.pdf

[andreaspiezia9]

Posted on November 15, 2013 at 10:13

Thanks

[wohler]

Posted on December 10, 2013 at 03:41

I'm also having difficulty locating such a table for the STM32L152xB. The datasheet has a list of functions for each pin, but no table of how they are mapped to the AFRL/H. Any thoughts?

[Tesla DeLorean]

Posted on December 10, 2013 at 04:27

I'm also having difficulty locating such a table for the STM32L152xB. The datasheet has a list of functions for each pin, but no table of how they are mapped to the AFRL/H. Any thoughts?

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00277537.pdf

AFRL describes pins 0-7, AFRH pins 8-15. Each pin source is described by 4-bits, 8x4 = 32-bits in the AFRL/AFRH. The source AFIO[0..15] represents the 4-bit encoding.

[ashish]

Posted on December 11, 2013 at 14:41Hello,the datasheet you have mentioned above has specified the alternate function  correctly but not in my case of stm32f407vg controller in UM1472 User Manual....its like AF ...USART2_RTS/USART4_RX/ETH_RMII_REF_CLK/ETH_MII_RX_CLK/TIM5_CH2/TIMM2_CH2/ADC123_IN1any idea about AFx?is it like AF0/AF1/AF2/AF3.........?